Filter



(No Model.) l

G. BRINGKMAN & F. WIEDERHOLDT. FILTER.

No. 545,221. Patented Aug. 27, 1895.

UNITED STATES PATENT GEETCE.

GEORGE BRINCKB'IAN AND FERDINAND VIEDRHGLDT, OF ST. LOUIS, MISSOURI.l

FILTER.l

SPECIFICATION forming part of Letters Patent No. 545,221, dated August 2'?, 1895.

Application led October 5, 1894.

"0 a/ZZ whom t may concern:

Be it known that we, GEORGE BRINGKMAN, a subject of the Emperor ot' Germany, and FERDINAND WIEDERHOLDT, a'oitizen of the United States, residents of the city of St. Louis, State of Missouri, have invented a eertain new and useful Improvement in Filters, of which the following is a full, clear, and exact description, referencev being had to the accompanying drawings, forming part of this specification, wherein like letters oit' reference refer to like parts, and in which;

Figure l is a vertical cross-sectional View. Fig. 2 is a detail view, partly in section, and taken at right angles to the View illustrated in Fig. l; and Fig. 8 is an inside face view of the removable filtering-stone and its supporting-plate.

Our invention relates to a new and useful invention in ilters; and it consists, generally stated, in peculiar features of construction,

arrangement, and combination et the several parts comprising our lilter, which will hereinafter be described, and more fully pointed out in the claims.

The object of our present invention is to construct what is known as a pressure-filter, which is adapted to be arranged in the length of a supply-pipe, said filter being so oonstruoted that the water or other fluid `may pass therethrough unobstructed by the manipulation of the several cocks, and When it is desired to obtain filtered water the cook at the bottom of the straightvvay ot the filter is shut ed, and the pressure of the Water forces the same through the filtering-stones on both sides ot the straightway into chambers for the fluid, which chambers are preferably counected on the inside of the easing, so as to permit a pipe to be attached to one of said chambers to draw the filtered water oit in a single stream.

In the drawings, A indicates the casing or shell, which is formed with athreaded opening at its top to receive a coupling B, by which the filter may be attached to the supply-pipe'. The end of this coupling projects inwardly into the shell in the form of a spray-nozzle C,

Serial No. 524,947- (No model.)

which spray'- nozzle is preferably made by sawing or otherwise forming small slits in the sides of the `coupling next to the filteringstone, through which the water is forced in a thin sheet against the surface of the filteringstone.

The open end of the casing A is closed by a flange-cap D., which is bolted or otherwise secured thereto to malte a Water-tight joint.

The end walls of the casing A and the cap D are formed with openings a and d, through which may pass the filtered Water from the ltering-stones E and F. -The filtering-stones are arranged in the easing A and cap D as follows: Said parts being formed with the openings a and d, before referred, to are laid face up on a suitable table or support, or if desired a bed of sand, which would partially ll the opening in the end Wall and upon the bottoms of the parts is laid abedding of oement, which is spread ont so as to fill allot' theopeningsa and CZ, leaving a surplus around the edges. The filtering-stones are now placed in position and forced to their seats, forming a tight joint with the end Wall ot the casing and cap and causing the surplus cement to iill the spaces between the edge of the stones and the walls of the casing and cap. The oement is now packed around the edges and leveled oft', and the inner face of the stone preferably scraped, so as to remove the adhering cement deposited during the operation of embedding the stones. After the cement -has become set and dry small cavities are bored through the openings a and d to sonle depth into the stone, thus removing the cement from said openings and by boring into the stone exposes a larger filtering-surface for the Water, which thereby increases the capacity. The object of this method of seating the filtering-stonesgby embedding them in cement is to make a solid wall to resist the lateral pressure of the Water, and the obj ect of boring the holes a and d after the stones have been so embedded is to remove the cement from said openings, permitting a free passage of the Water therethrough, and by boring into the stone a larger filtering area is presented for the filtered water, which compensates for the filtering area taken up by the metal end walls.

G and H are endclosing caps, which are introduced upon the end of the casing and cap D, said caps G and H being preferably made of thin sheet metal, Which is bulged at its middle to form chambers for the filtered water, and the side flanges are tapered ontwardly so that when said end-closing caps are introduced upon the parts A and D they may be forced home by pressure to form a Watertight joint, at the same time securing permancy. In order to make this close joint, the side Walls of the parts A and D are also preferably tapered to correspond With the flanges of caps G and H, and when the caps Gand I-I are introduced the side Walls of the parts A and D are painted or 'coated with shellac or other substance to insure a tight joint.

I indicates an opening formed on the inside of the casing A, Which leads to the chamber formed by the cap G, and registering with opening I is an opening J, formed in the cap D, said opening J leading from the chamber formed by cap II, the object of said connection I .I between the chambers for the filtered Water being to connect them, so that but one outlet-pipe is necessary to carry off the fil tered Water, which may be done by connecting the pipe to nipple g on the casing G. This nipple g is preferably located at the upper end of the casing G, so that when it is desired to clean the inner faces of the filtering-stone the supply may be cut off and the cock K, at the lower end of the straightway, opened. The back pressure of the Water from both the chambers for the ltered Water Will have a tendency to loosen the particles on the inner faces of the filtering-stone and dislodge them, so that they will fall off and pass out cock K. After this has been practiced a suficient length of time, Water may be admitted through the supply-pipe, and passing through nozzle C will be sprayed With force against the inner faces of the stones, and any remainingforeign particles will be flushed off through the cock K. In order to facilitate this operation of cleaning the lter, We arrange at the top of the casing A an automatic air-valve L, which, when the pressure is removed in the straightway chamber by cutting off the supply and the cock K opened, Will admit air at the top of the Water in said straight- Way and permit the same to run out cock K. This relief of the pressure from the inside of the filtering-stones will permit the back-pressure of the filtered Water to act With more effect to dislodge the foreign particles on the inner filtering-surfaces. When the cock K is closed and the supply-pipe opened, the straightway will quickly be filled up, and, the pressure being exerted on the under side of the air-valve, will close the same to prevent the passage of Water therethrough and permit the pressure to force the water through the filtering material. At the side of the casing A lWe preferably form an opening, which is closed by a blind plug M, which plug may be removed when desired to `permit, the insertion of a brush to clean the filtering-surfaces should they become coated to such an extent Withfforeign particles that the back-pressure and the nozzle C Would not be sufficient to dislodge them properly.

Having thus described our invention, what We claim, and desire to secure by Letters Patent, is-

1, In a filter, the combination with. a casing, formed with a perforated end wail, of a filtering stone in said casing in juxtaposition to said perforated end-Wall, a cap G forming a chamber beyond said perforated end Wall a perforated end closing plate for closing the open end of the casing, a filtering stone mount ed in said plate, and a cap II forming a chamberbeyond said perforated end closing plate, substantially as described.

2. In a filter, the combination with a casing formed with perforated end Walls, of liltering stones in juxtaposition to said perforated end Walls, cement which is interposed between said filtering stones and perforated end Walls, said cement being bored out at the perforations, the boring extending somewhat into the outer faces of the filtering stones, caps G and H on the ends of the casing form* ing chambers for the filtered Water, and an opening I-J which connects said chambers inside the casing, substantially as described.

3. In aliilter, the combination with the casing formed with an opening I, of the perforated plate D formedwith an opening .I which registers with opening I of the casing, of the end caps G and H forming chambers for the filtered fluid, which said openings I-J con neet, substantially as described.

4:. In a lter, the combination with the casing, of ltering stones located in each end thereof, an inlet nozzle formed With slits in its sides nearest the filtering stones, located at the top of the casing and between the filtering stones, an outlet cock for unfiltered Water located at the bottom of the casing and between the stones, end closing caps for the casing forming chambers for the filtered Water which chambers are connected by opening I-J inside the casing, and an outlet pipe for filtered Water which is located near the upper edge of one of said closing caps, substantially as described.

5. In a lter, the combination with a suitable casing having perforated end Walls, of filtering stones arranged in the casing near the Walls, said stone being recessed at each perforation in the end plates, caps G-H upon the ends of the casing for the filtered Water,

IOS

IIO

a spray nozzle C formed with slits in its sides signatures, In presence of two witnesses, this nearest the ltering stones, an outlet cook K 24th dey of August, 1894.

arranged :Lt the bottom of the casing, and an GEORGE BRINCKMAN.

air valve L which is mounted in the casing FERDINAND WIEDERHOLDT. 5 between the two filtering stones near the inl/Vitnesses:

let nozzle C, substantially as described. F. R. CORNWALL,

In testimonyr whereof We hereunto afx our HUGH K. WAGNER. 

